Q. For a photoelectric cell the graph showing the variation of cut off voltage $(V_{o})$ with frequency $(v)\ $of incident light is$\ $best represented by
A)
B)
C)
D)
Explanation
(d) According to Einstein’s equation
$hv = W_{o} + K_{\max} \Rightarrow V_{o} = \left( \frac{h}{e} \right)v - \frac{W_{o}}{e}$
This is the equation of straight line having positive slope $(h/e)$ and intercept on $- V_{o}$ axis, equal to $\frac{W_{o}}{e}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.